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importgl.cpp
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/* San Angeles Observation OpenGL ES version example
* Copyright 2004-2005 Jetro Lauha
* All rights reserved.
* Web: http://iki.fi/jetro/
*
* This source is free software; you can redistribute it and/or
* modify it under the terms of EITHER:
* (1) The GNU Lesser General Public License as published by the Free
* Software Foundation; either version 2.1 of the License, or (at
* your option) any later version. The text of the GNU Lesser
* General Public License is included with this source in the
* file LICENSE-LGPL.txt.
* (2) The BSD-style license that is included with this source in
* the file LICENSE-BSD.txt.
*
* This source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the files
* LICENSE-LGPL.txt and LICENSE-BSD.txt for more details.
*
* $Id: importgl.c,v 1.4 2005/02/08 18:42:55 tonic Exp $
* $Revision: 1.4 $
*/
#undef WIN32
#undef LINUX
#ifdef _MSC_VER
// Desktop or mobile Win32 environment:
#define WIN32
#else
// Linux environment:
#define LINUX
#endif
#ifndef DISABLE_IMPORTGL
#if defined(WIN32)
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <tchar.h>
static HMODULE sGLESDLL = NULL;
#endif // WIN32
#ifdef LINUX
#include <stdlib.h>
#include <dlfcn.h>
static void *sGLESSO = NULL;
#endif // LINUX
#endif /* DISABLE_IMPORTGL */
#define IMPORTGL_NO_FNPTR_DEFS
#define IMPORTGL_API
#define IMPORTGL_FNPTRINIT = NULL
#include "importgl.h"
/* Imports function pointers to selected function calls in OpenGL ES Common
* or Common Lite profile DLL or shared object. The function pointers are
* stored as global symbols with equivalent function name but prefixed with
* "funcPtr_". Standard gl/egl calls are redirected to the function pointers
* with preprocessor macros (see importgl.h).
*/
int importGLInit()
{
int result = 1;
#ifndef DISABLE_IMPORTGL
#undef IMPORT_FUNC
#ifdef WIN32
sGLESDLL = LoadLibrary(_T("libGLES_CM.dll"));
if (sGLESDLL == NULL)
sGLESDLL = LoadLibrary(_T("libGLES_CL.dll"));
if (sGLESDLL == NULL)
return 0; // Cannot find OpenGL ES Common or Common Lite DLL.
/* The following fetches address to each egl & gl function call
* and stores it to the related function pointer. Casting through
* void * results in warnings with VC warning level 4, which
* could be fixed by casting to the true type for each fetch.
*/
#define IMPORT_FUNC(funcName) do { \
void *procAddress = (void *)GetProcAddress(sGLESDLL, _T(#funcName)); \
if (procAddress == NULL) result = 0; \
*((void **)&FNPTR(funcName)) = procAddress; } while (0)
#endif // WIN32
#ifdef LINUX
#ifdef ANDROID_NDK
sGLESSO = dlopen("libGLESv1_CM.so", RTLD_NOW);
#else /* !ANDROID_NDK */
sGLESSO = dlopen("libGLES_CM.so", RTLD_NOW);
if (sGLESSO == NULL)
sGLESSO = dlopen("libGLES_CL.so", RTLD_NOW);
#endif /* !ANDROID_NDK */
if (sGLESSO == NULL)
return 0; // Cannot find OpenGL ES Common or Common Lite SO.
#define IMPORT_FUNC(funcName) do { \
void *procAddress = (void *)dlsym(sGLESSO, #funcName); \
if (procAddress == NULL) result = 0; \
*((void **)&FNPTR(funcName)) = procAddress; } while (0)
#endif // LINUX
#ifndef ANDROID_NDK
IMPORT_FUNC(eglChooseConfig);
IMPORT_FUNC(eglCreateContext);
IMPORT_FUNC(eglCreateWindowSurface);
IMPORT_FUNC(eglDestroyContext);
IMPORT_FUNC(eglDestroySurface);
IMPORT_FUNC(eglGetConfigAttrib);
IMPORT_FUNC(eglGetConfigs);
IMPORT_FUNC(eglGetDisplay);
IMPORT_FUNC(eglGetError);
IMPORT_FUNC(eglInitialize);
IMPORT_FUNC(eglMakeCurrent);
IMPORT_FUNC(eglSwapBuffers);
IMPORT_FUNC(eglTerminate);
#endif /* !ANDROID_NDK */
IMPORT_FUNC(glBlendFunc);
IMPORT_FUNC(glClear);
IMPORT_FUNC(glClearColorx);
IMPORT_FUNC(glColor4x);
IMPORT_FUNC(glColorPointer);
IMPORT_FUNC(glDisable);
IMPORT_FUNC(glDisableClientState);
IMPORT_FUNC(glDrawArrays);
IMPORT_FUNC(glEnable);
IMPORT_FUNC(glEnableClientState);
IMPORT_FUNC(glFrustumx);
IMPORT_FUNC(glGetError);
IMPORT_FUNC(glLightxv);
IMPORT_FUNC(glLoadIdentity);
IMPORT_FUNC(glMaterialx);
IMPORT_FUNC(glMaterialxv);
IMPORT_FUNC(glMatrixMode);
IMPORT_FUNC(glMultMatrixx);
IMPORT_FUNC(glNormalPointer);
IMPORT_FUNC(glPopMatrix);
IMPORT_FUNC(glPushMatrix);
IMPORT_FUNC(glRotatex);
IMPORT_FUNC(glScalex);
IMPORT_FUNC(glShadeModel);
IMPORT_FUNC(glTranslatex);
IMPORT_FUNC(glVertexPointer);
IMPORT_FUNC(glViewport);
#endif /* DISABLE_IMPORTGL */
return result;
}
void importGLDeinit()
{
#ifndef DISABLE_IMPORTGL
#ifdef WIN32
FreeLibrary(sGLESDLL);
#endif
#ifdef LINUX
dlclose(sGLESSO);
#endif
#endif /* DISABLE_IMPORTGL */
}